Gauge



March 11, 1952 H. H. GATES ET AL GAUGE Filed April 6, 1950 I 1% fdzzZ/Zfr 75 lid?!" 4 Patented Mar. 11, 1952 GAUGE Hassle-r H. Gates,Charlestowh, N. H., and Paul A. Grobey, Springfield, Vt., assignors toBryant chucking Grinder Company, Springfield, Via, a corpnration ofVermont Application April 6, 1950, Serial No. 154,332

This invention relates to gages for measuring either internal orexternal diameters, or other distances, and has for an object to providea precision gage of light weight, smooth in action, durable, andinexpensive.-

A further object is to provide such a gage in which the gaging pressureof the anvils against the work is uniform, irrespective of variations inmanipulation by difierent operators.

To these ends, the gage comprises a pair of members, each supporting agaging anvil, one of the members having a handle, and the other memberbeing carried by the one member and yieldable in one plane relativethereto, a spring, which may be housed within the handle, applying thegaging pressure to the yieldable member in work-engaging direction.

For a complete understanding of this invention, reference may be had tothe accompany ing drawings in which Figure 1 is a top plan view of aninternal gage embodying the invention, the gaging anvils being omitted.

Figures 2 and 4 are detail sectional views on lines 2-2 and 4-4,respectively, of Figure 1.

Figure 3 is a side elevation of the gage, a portion of the handle beingbroken away.

Figure 5 is a detail sectional view through the attachment of a reed toone of the members.

Figure 6 is a top plan view; similar to Figure 1, :but showing threadgaging anvils in position to receive a work piece for gaging.

Figure 7 is a view similar to Figure 6, but showing an external gageembodying the invention.

Figure 8 is a fragmentary view similar to a portion of Figure 2, but forthe external gage shown in Figure 7.

Referring to the construction shown in Figures 1 to 6, at I and 2 areshown two members with pads for supporting gaging anvils. One of thesemembers, as I, is provided with a hollow handle 3. The other of saidmembers 2 is secured to the member I for motion transverse to the handle3 in one plane. This means, as shown, comprises a pair of spacedparallel reeds 4. Each of these reeds is secured at one end as by screws5 to the member I, and the otherend of each reed. is secured as byscrews 6 to the member 2. As shown best in Figure 2, these reeds 4 areof substantial width, thus to afiord substantial resistance to relativemotion of the members 1ongitudinally ofthe handle '3, but permitting themember 2 to be moved transverse to the handle 3 in a single plane and insubstantially a rectilinear direction. A

Since the gage shown in Figures 1 to 6 are for internal gaging, themembers are provided with anvil elements I0 and II, and for threadgaging these anvils have their shank portions I2 externally threaded forportions of their circumference as at 14 for gaging engagement withinternal threads of a work piece. The anvil I0 is shown as secured-tothe movable member 2 as by screws lit-while the anvil II is secured tothe fixed member -I as by screws I3. As shown, the members I and 2 areprovided with pads shaped to receive feet I6 of the anvils.

A leaf spring 20 is shown housed within the hollow handle 3, one endofthis spring being supported and restrained by the reduced end of ascrew 2| fitted in a hole in the spring, and the other end 22 engagingagainst an edge 23 on the movable member -2. Intermediate the ends ofthe spring 20, it bears against a fulcrum projection 25 on the innersurface of the handle 3.,

With this arrangement the spring 20 presses the movable member 2 to theright, as viewed in Figure 2, and under a pressure which may be adjustedby adjustment of the screw 21. This direction of motion of the movablemember I is' that required to close the anvils against the work,separating the anvils'from each other. The extent to which this may :bedone by the spring 20 is determined byan adjustable stop screw 26threaded through a portion 21 of the movable member 2 and held inadjusted position as by a set screw 28.

The gage may be opened to permit of its insertion in the work or theplacing of the work thereon by pressing upon a finger piece 28projecting downwardly from the movable member 2 and provided with anadiustable stop screw 29 to limit the opening movement. During thisopening movement the anvils I0 and II are pressed toward each other. Q

The reeds 4 have thickened end portions 38, shown best in Figure 5,which are provided with holes,,having tapered sides 3| in register withtapered sides 32 of holes in the supporting memhers I and 2,respectively. These holes are for the reception of the conical portionsof the heads of screws 33 by which the reeds are positively secured andfastened to said supporting members. This construction provides a rigidand secure fastening of these parts together. The fixed member I, asbest shown in Figure l,

is provided with a lateral extension 35 having a split bearing portion36 to clampingly receive the a screw 39 being employed for clamping thesplit portions 36 together, thus gripping the sleeve 31. An indicatoractuating stem 40 is slidable through the sleeve 31 and may be engagedby an arm 4| projecting from the movable member 2. These parts may be soadjusted that when an internal threaded ring of a standard size ispassed over the gaging anvils and the spring 20 is then allowed to pressthe anvils into proper gaging engagement with this ring, thepointer ofthe dial indicator 38 is at the zero mark. Any deviations of the pointerfrom this zero mark then occurring when an internallythreaded hole isbeing measured will indicate either under or over size of the threadedhole.

It will be noted that both of the anvils are positioned between thereeds 4, so that the gaging forces are exerted in such a manner as toaiford minimum undesirable eccentric stresses on the parts, and that thereeds which are relatively wide, impart great stiffness against anyrelative motion of the members other than that desired for gaging andreleasing actions.

Figure 6 shows the anvils for internal gaging, the anvils being ingage-open position, facilitating the placing of a work piece Wthereover.

While this invention is not concerned with the particular configurationsof the gaging elements, they are shown as those more completelillustrated and forming subject matter of a cc-pendin application forLetters Patent of one of the present inventors.

In Figures 7 and 8 a gage of this same general typeis illustrated, butin which external gaging is accomplished, the relatively movable member200 carrying the external gaging anvil 58 and the relatively fixedmember carrying the external gaging anvil 5|. These members are securedtogether as by the reeds 4, as previously described, and the movablemember 200 is provided with an arm 52 for engagement with the stem 40 ofthe dial indicator 38, the sleeve 37 of which is clamped to theextension 53 of the relatively fixed member i. This member I alsocarries a hollow handle 3 as shown in Figure 1,

' but the spring 20 engages the movable member 200 to move this memberin the opposite direction from that provided for in the internal gage.To this end the upper end of this spring extends through a perforation55 through the member 200 and bears against the outer wall thereof asshown in Figure 8. A finger 60 carried by the movable member 200 maythen be engaged by the operators fingers and moved away from the handle3 in order to open the anvils for the removal or replacement of a workpiece. screws 26 and 29 may be employed to limit the motion of themovable member as in the internal gage. Where this work piece is anexternally threaded member, these anvils will be provided Stop withthreaded gaging contours and while any suitable anvils may be employed,the ones illustrated in Figure 7 are those more completely shown andclaimed in the application of one of the present inventors, to whichreference has been made. It will be noted that with this form of gage,also, the gaging anvils are positioned between the reeds I.

From the foregoing description of certain embodiments of this inventionit will be evident to those skilled in the art that various changes andmodifications may be made without departing from its spirit or scope.

We claim:

In combination, a pair of anvil supporting members, a gaging anvilcarried by each of said members, a pair of reeds arranged in parallelrelation one end of each of said reeds being secured to one of saidmembers and the other end of each of said reeds being secured to theother of said members, said reeds supporting one of said members foryieldin rectilinear motion relative to the other of said members indirection to move said anvils relatively from and toward each other toopen and close said gage, an indicator carried by one of said membersand provided with an actuating stem in controlled relation to the otherof said members, a hollow handle carried by one of said members andextending transverse to the plane of relative motion between saidmembers, a leaf spring within the hollow of said handle, ahandle-carried element engaging said spring adjacent to one end, theopposite end of said spring operatively engaging the other of saidmembers, said handle having a fulcrum portion engaged with said sprinbetween its ends, said spring normally urging said movable member towardgage-closed position, and a finger element carried by said other memberin position to be engaged by a portion of the hand grasping said handleand be moved in opposition to said spring to open said gage.

HESSLAR H. GATES. PAUL A. GROBEY.

REFERENCES CITED The following references are of record in the file ofthis patent:

